not quite charbax. see latest review (June 2012) by IDC for example.
http://www.idc.com/getdoc.jsp?...
they see iOS tablets (so $400 price tag & beyond) making 62,5% of the market. The total market size is 107m units.
in 2016 there will be a 222 million units market size and then indeed possibly a market for 80 to 100 million units sub $200
(forrester is the most bullish and they see 375 million units by 2016). you can also see one of their analysis here http://tommytoy.typepad.com/to... where they clearly see dominance of iOS (thus expensive) till 2016